Roddick, Verdasco move on

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, Last Updated: 9:44 AM ET

WASHINGTON -- Second-seeded American Andy Roddick and third-seed Fernando Verdasco were second-round winners on Tuesday at the $1.402 million Legg Mason Tennis Classic, a hardcourt U.S. Open Series event. Roddick, who received a first-round bye, downed Slovenian Grega Zemlja in straight sets, 6-4, 6-4 at the Fitzgerald Tennis Center. Verdasco had a much tougher time with Germany's Michael Berrer, needing two hours, 41 minutes to post a 4-6, 7-5, 7-6 (8-6) result. Juan Martin del Potro, who is not defending his titles this week, topped Roddick in last year's final here and also captured this event in 2008. The former world No. 1 Roddick titled here in 2001, 2005 and 2007 Also on Tuesday, fourth-seeded Croat Marin Cilic sent down Denis Istomin of Uzbekistan by a 6-4, 6-2 count; Xavier Malisse toppled 12th-seed Julien Benneteau 7-5, 6-4; 13-seed Gilles Simon advanced past Igor Kunitsyn 6-1, 6-2; Ryan Sweeting upended 14th-seeded Michael Llodra 6-4, 6-2; Mardy Fish, the 15th-seeded American, bested Viktor Troicki 6-4, 6-3. In the nightcap, American and five-seed John Isner was forced to gut out another victory, this time a 7-6 (8-6), 7-6 (10-8) decision against Thiemo De Bakker of the Netherlands which took nearly two hours. First-round action in the U.S. capital saw Belgian Kristof Vliegen win by retirement over France's Richard Gasquet after taking the first set 6-3. Gasquet, who was last week's runner-up in Gstaad, was forced out of action after just 37 minutes. Frenchman Arnaud Clement was the big winner here in 2006, but was bounced unceremoniously from the tournament by Janko Tipsarevic of Serbia 6-4, 6-0. Alejandro Falla also won in straight sets over Yen-Hsun Lu 7-5, 6-1 and Marco Chiudinelli beat Brian Dabul 7-6 (7-3), 6-2. The top seed this week is Wimbledon finalist Tomas Berdych, who received a bye into the second round, along with 15 other seeded players. The 2010 Legg Mason champion will pocket $261,500.

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